There are bits of code in Valve's Source Filmmaker suggesting plans are in place for a next version of Valve's Source engine. Here's an example: ""Return an str with the current engine version. If key doesn't doesn't [sic] exist, assume 'Source', otherwise invalid -- assume next-gen 'Source 2'." Thanks Valvetime.net via Eurogamer.

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Mordecai Walfish wrote on Aug 6, 2012, 16:48:I think it's beyond just the engine similarities. Design choices were made that accentuated this 'floaty' feeling. Take grenades for example, those seemed incredibly jank in HL2 and just flew around with this overly cheap anti-gravity feeling.

Which is actually no different than the way that the GL worked in Quake or TF way back in the day, or how player thrown nades worked in TF. It's not so much "similarity" as "this engine is based on that actual code and has evolved over time from there", which, if I recall, is the same way UE is developed.